A trip to Wendy’s is nothing without its famous frozen treat. And now for only $2 you can get that Frosty for free every time you visit the fast food joint.

This holiday season, Wendy’s is selling a Frosty Key Tag for $2. The tag will support a foster child as they wait for permanent home and is a pass to get a free Jr. Frosty with any purchase for a year.

Just don’t redeem them too fast — or you might get the dreaded ice cream headache.